gif tunnel problem.

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Date: Wed, 17 Mar 2004 18:55:29 +0000
To: FreeBSD-questions <questions@freebsd.org>

Hi,

This is the first time I've looked at gif tunnels and I'm only trying to
do something simple (by that I mean no IPsec, etc.)

  Diagrams are always useful for this, so here goes:

   (int) (ext) (ext) (int)
xl0 192.168.0.1 xl1 a.b.c.d -> 'net -> sis0 w.x.y.z rl0 192.168.1.1
192.168.0.x/24 192.168.1.x/24

  That's a pretty poor diagram, sorry. Basically HostA has is the
default router for 192.168.0.0/24 with in 192.168.0.1 and external ip
a.b.c.d. HostB is the same for 192.168.1.0/24 with external ip w.x.y.z.

  I want to set up an unencrypted tunnel between the two subnets using
gif. So far on HostA I have:

ifconfig gif0 create
ifconfig gif0 tunnel a.b.c.d w.x.y.z
ifconfig gif0 192.168.0.1 192.168.1.1

and on HostB:

ifconfig gif0 create
ifconfig gif0 tunnel w.x.y.z a.b.c.d
ifconfig gif0 192.168.1.1 192.168.0.1

  I got these from the IPsec chapter in the handbook. It states at this
point I should be able to ping 192.168.1.1 from HostA. This does not
work.

  I see the echo in gif0 (using tcpdump) but it never seems to exit the
gif tunnel and hit xl1. The same is true for HostB.

netstat -rn on HostA shows:
192.168.1.1 192.168.0.1 UH 0 3183 gif0

with an equivalent entry on HostB.

  What am I doing wrong? I've tried to follow the chapter as best I can
but it has been little help. Anybody able to point out the error in my
ways?

  Thanks a lot,

-lewiz.

-- 
I was so much older then, I'm younger than that now.  --Bob Dylan, 1964.
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